$addition:10px+20px;
$subtraction:100px-$addition;
$multiplication:$subtraction*2;
$division:$multiplication/2px;

$compare1:10px > 5px;
$compare2:10 < 5px;
$compare3:10 >= 5;
$compare4:5 <= 10;
$compare5:5 == 6;

$string1:r + ed;
$string2:r / ed;
$string3:r - ed;

$bool1: true and false;
$bool2: true or false;
$bool3: not false;
